Shimano Dura Ace Bottom Bracket – BB R9100 (Hollowtech, BSA Threaded)

The Shimano Dura Ace Bottom Bracket  Threaded – Hollowtech II – 68/70 mm shell width comes with an advanced seal construction for smoother rotation and small ball bearings to minimize weight, the Shimano Dura Ace bottom bracket is offered in both pressfit and threaded options.